someone more educated about RBs than i am will have to chime in here and help you, but let''s just say i''d be wary. there must be a reason that stone is so cheap.
Generally, if the price is too good to be true it is. Honestly...this stone could be sold for what $11 or $12k? maybe a tad more? if it were so-so good? Why would anyone want to sell it for less than $6k? It is weird..check to see if it has been enhanced at all?
I am sure it is not a great stone but if it is a decent looking 2 carat and size is of primary importance (which it is to many people) it may be worth having a look at it.
People who are on Pricescope are mainly well informed and put cut and brilliance above all else. But the average consumer often does not feel that way and most people who see your diamond will just look at the size. Everyone has their own priorities.
If this is not a typo you might want to have a look at it if you really want size over quality and there is nothing wrong with that as long as you know what you are doing.
Will this company send the stone to an appraiser where you can see it before you pay? Many Pricescope vendors will accommodate you in that way.
It sure sounds like a lot for the money and if you are interested you should put a hold on it before someone else grabs it up.